Anchor rods



Sept- 19, 1967 CHARLES-EDWARD RocHELEAU 3,342,097

ANCHOR lRODS Filed Dep. 27, 1965 UnitedStates Patent Otice 3,342,097ANCHOR RODS Charles-Edward Rocheleau, Box 391, Sudbury, Ontario, CanadaFiled Dec. 27, 1965, Ser. No. 516,380 3 Claims. (Cl. 85-79) ABSTRACT OFTHE DISCLOSURE This invention relates to anchor rods.

More particularly, the invention relates to an anchor rod having twoearth-engaging members operable by moving the members relatively towardone another in the axis of the hole into which the anchor rod isreceived and in which it is to be locke-d. Such a rod is also known as amine roof bolt or rock anchor. In the anchor rods of this invention aU-shaped member is fixed to one of said earth engaging members, the legsof the U-shaped member being slidably received in grooves in the otherof said earth engaging members.

The object of the invention, generally, is to provide an improved anchorrod of the kind having two earthengaging members.

A specific object of the invention is to provide an .anchor rod havingtwo earth-engaging members relatively laterally displaceable toward thewall of the hole into which the rod is received and in which it is to belocked, upon the relative displacement of the members in the axis of thehole.

Another specic object of the invention is to provide such a device somade that all of the component parts are assembled as a unit, ready tobe used.

Other advantages of the invention may be gleaned from reading thespecication to follow.

In the drawing, wherein like numerals of reference indicatecorresponding parts in the various gures,

FIGURE 1 is a side elevation of the device in its initial, unloadedposition;

FIGURE 2 is a longitudinal sectional view of the device introduced intoa hole and held in such position, preparatory to operating the devicefully to operate the jaws to their intended, operative locked positionin the hole, the rod of the device being shown in elevation;

FIGURE 3 is an elevation of the device, now in operated (expanded)locked position in the hole;

FIGURE 4 is a section on line 4-4 in FIGURE 2; and

FIGURE 5 is a section on line 5 5 in FIGURE 2.

As is known, an anchor rod is inserted into a prepared hole, shown as H,drilled into rock or the like from the surface.

As already stated, two members or elements adapted to be relativelydisplaced both longitudinally and laterally are provided as means forlocking the anchoring device in the hole H. Such members are shown asand 11.

The member 10 is formed with an axial threaded bore in which isthreadingly received the threaded shank portion 14 of the anchor bolt12. The anchor bolt 12 is rotated on its axis by a head 13. The bore ofthe member 10 is enlarged as at 19. One side of the member 10 is cut offalong a plane disposed at an acute angle to the longitudinal axis of thebolt, thus presenting inclined or bevelled edges 15.

y 3,342,097 Patented Sept. 19, 1967 The diameter of the member 10 issuch as to just be freely received into the hole H.

The complementary member 11, formed with a circular recess or bore 32,presents two slanted edges 16 which are adapted to engage and-co-operate with the inclined edges 15 of the companion member 1D. Ineffect the two members 10 and 11 constitute co-operating wedges.

Fixed to the wedge member 11, adjacent its apex as at W (see FIGURE 2)is one leg 17 of a U-shaped device shown as 18, the other leg 24 ofwhich is directed substantially parallel to the leg 17. The legs 24 and17 of the device 18 are received, and are slidable in rec- Langulargrooves 22 made into the wall of the mem- As will be seen, the deviceassumes essentially three positions, such positions being a function ofthe relative longitudinal position of the member 11 and the companionmember 10. Thus, as seen in FIGURE 1, the initial and neutral positionof the member 11 is such that the device is unexpanded. The member 11 isin effect suspended from the member 10.

When the device is to be used it is first pre-loaded, this is, the bolt12 may be turned slightly in the member 10, say, by means of ones twohands, to engage at its upper end the horizontal leg 20 of the device 18and to raise the wedge member 11 rela-tively to the member 10. Themember 11, its edges 16 riding on the edges 15 of the member 10, willthus move laterally. As the member 11 rides on the member 10 and moveslaterally, the U- shaped device 18, more particularly its leg 17, bendsor ilexes outwardly from top to bottom so that, in effect, the wedgemember 11 is displaced laterally more at the lower end than at its upperend (as best seen in FIGURE 2). The device may now be said to bepreloaded, in that when inserted into the hole (as seen in FIGURE 2),the device is held in such position by the friction between the members10 and 11 and the wall of the hole, such friction being a function ofthe pressure of the members against the wall.

Alternatively, preloading may be eected by (manually) spreading thelower extremities of the members 10 and 11 apart permanently, to deformthe leg 17 slightly, so that the effective diameter of the complementarymembers 10 and 11 is larger than the hole. Such manual p-reloading maybe effected at the site.

As will be clearly seen, the device is supplied fully assembled, readyto be used, all of the component parts being held together as a unit.The rod is held to the member 10, and the members 10 and 11 are held oneto the other by the U-shaped member 18 which in turn is permanentlyattached to the member lll but removably attached to the member 10.

The bolt 12 is next pulled downwardly (lowered) as by turning a nut 40threaded on the rod against a plate 41 pressed against the formation.The wedge member 10 will now lower in the hole, sliding on the wedgemember 11, to its ultimate position, that is, the expanded position ofthe device, as best seen in FIGURE 3.

I claim:

1. In an anchor rod to be inserted into a cylindrical hole drilled intoa rst formation, the combination of a rod, a formation-engaging wedgemember through which said rod is threaded, a second formation-engagingwedge member, said two members subtending a transverse periphery ofsubstantially 360, cam means on said members whereby said members may berelatively displaced laterally to engage the formation as said membersare moved one toward the other axially of said rod, and a guide movableon said rst member in a direction parallel with the axis of said rod,said guide member being substantially Ushaped and including two legs,one of said legs being attached to the upper end of said second memberand the other of said legs being free and slidable in a longitudinalgrove formed in the wall of said first wedge member.

2. An anchor rod as in claim 1, wherein the legs of said U-shaped guidenormally converge slightly towards their ends whereby said guide tendsto retain said wedge means in assembled relationship for convenienthandling.

3. An anchor rod as in claim 1, including a nut threaded on said rod anda formation-engaging plate suspended by said nut and movable lengthwiseof said rod.

References Cited UNITED STATES PATENTS 3,221,590 2/1965 Dickow 85--76FOREIGN PATENTS 612,518 1/1961 Canada. 1,342,215 9/1963 France.

965,848 6/ 1957 Germany. 166,201 2/ 1959 Sweden.

CARL W. TOMLIN, Primary Examiner.

MARION PARSONS, JR., Examiner.

1. IN AN ANCHOR ROD TO BE INSERTED INTO A CYLINDRICAL HOLE DRILLED INTOA FIRST FORMATION, THE COMBINATION OF A ROD, A FORMATION-ENGAGING WEDGEMEMBER THROUGH WHICH SAID ROD IS THREADED, A SECOND FORMATION-ENGAGINGWEDGE MEMBER, SAID TWO MEMBERS SUBTENDING A TRANSVERSE PERIPHERY OFSUBSTANTIALLY 360*, CAM MEANS ON SAID MEMBERS WHEREBY SAID MEMBERS MAYBE RELATIVELY DISPLACED LATERALLY TO ENGAGE THE FORMATION AS SAIDMEMBERS ARE MOVED ONE TOWARD THE OTHER AXIALLY OF SAID ROD, AND A GUIDEMOVABLE ON SAID FIRST MEMBER IN A DIRECTION PARALLEL